Again, when was the source added?
Now I understand what you mean and why you ask about this.
This will take a second to explain. So I will now write this full story because this is a 1,5 year time involved and to understand this I need as before tell the full story about this guide and translations. I have to make screens, etc, so it will take a while.
I will update this post when ready, thank you.
This guide was written by me in 2018 (I don't know the exact date) in Polish on AltcoinsTalks forum. That was a short list with only a few first points. I advised Crypto mania to translate this to English language and publish here on Bitcointalk. I am not 100% sure now because Crypto mania has changed annotations with links in the footer of his post during the time and I would like that he explains that by himself, but I assume, that the first one was just a description: "this is a translation from another forum" because one can not add links to other forums (or I messed something up here). Is a long time back and now to remember all these interactions is really hard. Ok back to the topic.
Crypto mania added a few additional points from internet sources and posted this guide here on Bitcointalk. Discussion started and the list began to grow. At that time, I translated this extended guide again into Polish and published in our local section. In both topics, different answers were added and both lists began to grow separately from this moment. So we joined forces after some time and added all new points from each list to built really good guides in two different languages and forum sections. I think this is very good for the forum to have such high-quality content translated to a few languages for local sections (not native English speakers).
After I published my translation, from what I see, Crypto mania changed the link in the description, from the written one: "this post is a translation from another forum" to "@wwzsocki the author of the main version has published lately this post in polish language" and added link to my guide. Additionally, I added that this is my original work from other forum and link to Crypto mania translation in my guide too. Like I already said a couple of years ago I was a very bad poster and got problems because of wrong quotations. From this moment I learned my lesson and am very strict and exact with all quotations and added sources in descriptions.
I was not able to find the original post on AtlcoinsTalks because is a small forum and there were no answers in this thread. I assume was closed and deleted after so much time, which is common there.
Here screens with texts and links in descriptions of these posts and link to my profile on AltcoinsTalks, where I am a moderator and the only Judge (for irony).

https://www.altcoinstalks.com/index.php?action=profile;u=2563